Nipple



FIG. 1 is a top plan view of a first embodiment of a nipple;

FIG. 2 is a front view thereof;

FIG. 3 is a back view;

FIG. 4 is a left side view; and

FIG. 5 is a right side view;

FIG. 6 is a top plan view of a second embodiment of a nipple;

FIG. 7 is a front view;

FIG. 8 is a back view;

FIG. 9 is a left side view; and,

FIG. 10 is a right side view of the invention. 

CLAIM The ornamental design for a nipple, as shown and described. 